Make your Brain Sharp

1. Which interchange of signs will make the following equation correct?

25 − 5 + 32 ÷ 4 × 6 = 13.

a. − and ÷ b. × and ÷

c. – and + d. × and –

2. Which interchange of signs will make the following equation correct?

2 × 3 – 5 + 5 ÷ 5 = 10.

a. − and ÷ b. + and ÷

c. − and + d. × and –

3. If 2A = 3B =4C, then

A : B : C is ;

a. 2 : 3 : 4 b. 4 : 3 : 2

c. 6 : 4 : 3 d. 3 : 4 : 3

4. If A/3=B/4=C/5, then

A : B : C is ;

a. 4 : 3 : 5 b. 3 : 4 : 5

c. 5 : 4 : 3 d. 5 : 3 : 4

5. The ratio of 435 : 264 is same as :

a. 2 : 1 b. 64 : 1

c. 32 : 1 d. 16 : 1

6. If 1/5:1/x=1/x:1/125, then the value of x is :

a. 15 b. 20 c. 25 d. 35

7. A single discount equivalent to a discount series 10%, 20% and 10% is

a. 40 % b. 35.2 %

c. 30 % d. 25.8 %

8. The average of a non-zero number and its square is 5 times the number. The number is:

a. 9 b. 17 c. 29 d. 295

9. The average age of the boys in a class is 16 and that of the girls is 15 years. The average age for the whole class is :

a. 15 years b. 15.5 years

c. 16 years

d. Cannot be determined.

10. A man travelled from the village to the post-office at the rate of 25km/h and walked back at the rate of 4 km/h. If the whole journey took 5 hours 48 minutes. Find the distance of the post-office from the

village.

a. 10 km b. 15 km

c. 20 km d. 25 km

11. In what time will a train 100 m long, cross an electric pole, if its speed be 144 km/h?

a. 2.5 seconds

b. 3 seconds

c. 3.5 seconds

d. 4 seconds

12. A 5 digit number is to be formed using digits 1, 2, 3, 4, 5 and 6 without repeated any digits. How many such numbers can be formed which are divisible by 4?

a.248 b.216 c.256 d.236